Why workers wear high visibility uniform clothing?

Now
coming back to the workwear, the China workwear uniform are
really popular at the places like the construction sites and other
sites where the women work on the site or inside the plant of the industrial
zone or places like mining industry, construction industries etc. Though
China workwear uniform can also be worn at the fitness centre
as there are different types of activewear that are available in the
market which one can wear at different places. The most important thing about
this workwear is this that they are specifically made for the women and not the
ones which are for the men where it seems like two or three women can get
inside one of the workwear.